“Experts in diagnostic errors provided an answer to the puzzle that had been nagging me: How was it possible for missed diagnoses to be so common and yet not perceived by doctors as a major problem? The problem is that physicians, while generally aware that mistakes happen, greatly underestimate how often they make them. In his talks to doctors on the topic, Graber often asks how many have made a diagnostic error in the past year; typically, only about 1 percent of the hands go up. 'The concept that they, personally, could err at a significant rate is inconceivable to most physicians,' he writes. In short, they think it's the other guy. This overconfidence is not necessarily their fault: doctors simply do not get the feedback needed to gain an accurate sense of their batting average. They assume their diagnoses are correct until they hear otherwise. Since there are few, if any, health care organizations that systematically measure diagnostic error rates, they typically learn of their mistakes only from the patients themselves.”